Apparatus for concentrating sulfuric acid.



P. VIALLBIX & P. PERRIN.

APPARATUS Pon GUNGENTBATING sULPURIo ACID.

APPLIOATIGN FILED MAY 6, 1911.

1,066,557.Y Patented July 8, 1913.

IE'IERRE VIALLEIX AND FIEIRNANI')V PERRIN, OF VOLVIC, FRANCE.

APPARATUS Foa coNcaNrnArrNe sommare Acro.

Specification of Letters Patent.

Application mamy e, 1911. serial No. Gamas.

To all whom it may concern,

Be it known that we, PIERRE ViALLEIx and FERNAND PERRIN, citizens of theFrench Republic, residing at Volvic, Puy-de-Dome, France, have inventedcertain new and useful Improvements in Apparatus for ConcentratingSulfuric Acid, of which the following is a specification.-

This invention relates to improvements in apparat-us for concentratingsulfuric acid of the t-ype in which the concentration is effected byhotI gases which are drawn over and through theI liquid while thelat-ter is descending a series of trays or troughs the lowest of whichcontains a quantity cf concentrated acid and is provided with baflieplates so thatI the entering gases are drawn through the liquid.

This apparatus is known as the Kessler type.

The improvements forming the subject of this patent comprise:modifications made in the construction of the lowest trough of theKessler apparatus, the use ofl a new generator for this apparat-us whichdoes away with the use of porcelain,`the combination of the saidgenerator with the improved lower trough forming a new apparatus whichis stronger, cheaper and more economical than the existing apparatus. 1

The modifications made in the construction of the lower trough consistin obviating the use of puniice stone for the inner packing, and in thereduction of the blast and other iues formed by the battles. These blastflues, to t-he number of three in the old apparatus, have been reducedhere to one central flue, and the other'flues to the number of four,have been consequently reduced to two. The excessive number of blast andother flues necessitated a very complicated construction which weakenedthe apparatus, as they were constituted by very thin pumice stonepartitions, the lower parts of which deteriorated very easily eitherowingjto cleaning or to the working of the apparatus itself Thisimprovement makes possible the use of refractory materials other thanpumiee stone and of a sufficient thickness for insuring perfectstrength, thus avoiding the trouble and expense caused bythe frequentrepairs of the old apparatus. Lava or sandstone for example, could beused.

The drawing accompanying this description shows the improved apparatus.

Figure l is an elevation in longitudinal `the regenerator plates.

As shown in Figs. l-B of the drawing` only the two longitudinal batllesI) and b with a central gas inlet at c, have been retained. The hotgases coming from the gas generator, are drawn in by means of a fan orblower of any construction, into the ccntral flue d and dischargedvafterward into the twoflues c c. It follows from this arrangement thatthe working of the apparatus is greatly simplified, while offering thegreatest guarantee of strength. The cleaning of the apparatus is alsoeasier, the number of flues being reduced to a minimum. 0n coming outfrom the lower trough the hot gases are drawn into a regenerator ofnovel form. ln this regenerator, the use of porcelain parts such assupports, caps and retrogradation cups, has been do-ne away with, whilethe surfaces of contact between the hot gases and the acid to beconcentrated have been increased, which is an essential condition forevaporation and for insuringr high eil'iciency; In order to obtain thatrcsult, the device used comprises several superposed plates recessed soas to form each a cup intended to receive the acid to be concentrated.Each plate is moreover arranged in such a manner that its bottom portionacts in the same way as the porcelain caps of the plates in the oldapparatus. The retrogrz'ldation of the acid from cup to cup. takes placethrough the gas inlet opening f. rThis admission of the gases into eachcup takes place through a single orifice f (Figs. 1 and 4t) situated atthe side and alternating. Projections g and g are provided in the bottomportion of each plate situated above and at the same time forming acover. These projections g and g', while increasing the strength of theplates, touch the liquid in the plate below, thus forming the necessarycontact surfaces, and replace the porcelain caps hitherto used for thepurpose. The 10a resulting economy can be easily seen. On the one hand,the plates no longer having any cut-out portions required for thepassage of the porcelain supports, the number Patented July 8, 1913.

of which varied from 18 to 36 for each of 110 them, thus offeringguarantees of strength, cheapness and unusual durability comparedtothose of the old system, the numerous porcelain parts of which werefrequently broken by the action of sudden changes of temperature, thusrendering lthe use of the generator very precario-us and necessitatingfrequent repairs.

Owing vto the use of this new recuperator without special parts orjoints of any kind, the durability of the apparatus will be not onlygreater, but there will be also a considerable Saving of fuel, as theregenerator, always being in perfect condition, the concentration ofacid in the same will be more active and will thus have a higherconcentration, -so that the acid will enter the lower trough at 65 B.,which will greatly facilitate the work of the latter for obtaining acidsat 96 to 97% of HZSO4 required Vmore and more industrially.

Inspection and cleaning holes L are provided for each plate. l

That we claim as our invention and desire to secure by Letters Patent is:f-

1. Apparatus for concentrating sulfuric acid comprising a trough adaptedto conacid comprising a casing, a series4 of superposed plates withinsaid casing and arranged to permit hot gases to be drawn therebetween,weirs on said plates adapted to retain acid thereon, projections on thelower side of each of said plates extending below the surface of theacid on the next lower plate, a lower trough adapted to contain acid twobaflles projecting into said acid and a cover upon said battles, for thepurpose set forth.

3. Apparatus for concentrating sulfuric acid, comprising a troughadapted to contain concentrated acid, two longitudinally disposedbatlies formed of refractory material and a cover for said battlesarranged to cause gases drawn between said baffles toV pass below thesurface of said acid, in combination with a casing, a series of super-lposed plates wlthln said casing, weirs ony the upper sides of saidplates adapted to retain acid thereon through which hot gases may bedrawn through openings between said platesand projections onthe lowerside of each of said plates extending below the surface of the acid onthe next lower plate substantially as set forth. v In testimony whereofwe have signed our names to this specication in the presence of twosubscribing witnesses.

PIERRE VIALLEIX. FER-NAND PERRIN. Witnesses:

GEORGES TANGER, J Louis DAINDUR.

